sorry I previously wrote that I was using kernel-3.7.9-201.fc18.
Instead, at least on my BL685c G1 blades, the kernel I'm correctly
running with oVirt 3.2.1 is 3.7.8-202.fc18.x86_64
And the previous working one was kernel-3.6.11-3
Not tried yet latest 3.8 ones.
Gianluca